Al utilizar alfombrillas de soporte para sostener una grúa sobre orugas, ¿cuánto se debe extender la alfombrilla más allá de los extremos y los bordes de los carriles de la grúa?
a. Al menos dos pies (0,6 m)
b. Al menos cuatro pies (1,21 m)
c. Al menos seis pies (1,82 m)
d. Al menos ocho pies (2,43 m)
a. Al menos dos pies (0,6 m)
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